I know that if I took my car to a service center,paid good money for a service and was told that they did it by ’feel’. When they ’felt good’ about the intervention, that was all the car needed. I would feel ripped off.
If I went to catch a commercial jetliner and they said that the pilot didn’t learn how to fly. The new policy is that they abandon the instruments and do it by ’feel’. No training neccessary. I would never fly again.
If you aren’t serious about cartridge set up and want to do it by ’feel’. Go ahead. It is your property. Do what you wish.